# Relationship history for MSHA mine 5400327

Current hierarchy: **Paride C  Mazza → Rio Construction Corp → CANTERA RIO CONSTRUCTION**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Paride C  Mazza → CANTERA RIO CONSTRUCTION; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rio Construction Corp → CANTERA RIO CONSTRUCTION; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paride C  Mazza → Rio Construction Corp; 1990-09-01 to current/open; source msha-controller-operator-history